Light source for projection type display device

Abstract

A light source for use in a projection type liquid crystal display device. The light source includes an electrodeless light emitting member having a light emitting material sealed in a transparent tube to emit light upon the application of microwave electromagnetic energy. A concave mirror is arranged on the outside of the light emitting member, and the transparent tube is supported by a rotatable rod-like support member which extends through the concave mirror. Means in the form of a vane, a screw or a projection is arranged on the rod-like support member or on the light emitting member for stirring air, while the rod-like support member rotates, to cool the light emitting member.

We claim: 
     
       1. A light source comprising: a light emitting member including a transparent tube and a light emitting material for converting electromagnetic energy into light, wherein the light emitting material is sealed in the transparent tube;   a rod-like support member for supporting the light emitting member;   a rotating mechanism for supporting the rod-like support member with the light emitting member, the rotating mechanism rotating the rod-like support member with the light emitting member;   a concave mirror for reflecting the light emitted from the light emitting member; and   at least one vane or screw arranged on the rod-like support member and in the concave mirror, the at least one vane or screw inducing a flow of air around the transparent tube while the rod-like support member rotates.   
     
     
       2. A light source according to claim 1, wherein said rotating mechanism is arranged on the outside of the concave mirror, the concave mirror has an optical axis and an inserting hole located substantially on the optical axis, and said rod-like support member extends through the inserting hole of the concave mirror without contacting the concave mirror. 
     
     
       3. A projection type display comprising: a single light source device;   a color separation optical system for separating a light from the light source device into light beams of three primary colors;   three indirect modulation elements for modulating the respectively separated light beams for producing an image;   a color combining optical system for combining the light beams modulated by the indirect modulation elements; and   a projection lens for projecting the combined light;   wherein said light source device comprises: a light emitting member including a transparent tube and a light emitting material for converting an electromagnetic energy into light, wherein the light emitting material is sealed in the transparent tube;   a rod-like support member for supporting the light emitting member;   a rotating mechanism for supporting the rod-like support member with the light emitting member, the rotating mechanism rotating the rod-like support member with the light emitting member ;   a concave mirror for reflecting the light emitted from the light emitting member; and   at least one vane or screw arranged on the rod-like support member and in the concave mirror, the at least one vane or screw inducing a flow or air around the transparent tube while the rod-like support member rotates.